From: Alex Dean (Alex.Dean@xxxxxxxxxxxxx)
Date: Sat Aug 21 1999 - 18:51:26 GMT-3
There are two ways to attack this problem, both of which use a single subnet on
the frame cloud. There are obviously more ways if you can use sub-interfaces
on the hub router.
1) Configure it however you want and set the ip ospf network command (on the in
terfaces) to point-to-multipoint. This solves most problems, assuming you have
connectivity between each spoke and the hub.
2) If you don't want to use the point-to-multipoint command, then do the follow
ing:
a) Set up the hub router with no sub-interfaces, or with one multipoint sub-int
erface. Set: ip ospf network broadcast. In practice the static frame map comm
ands appear to be optional.
b) Set up each spoke router with either map commands, or as a point-to-point su
b-interface (which enables inverse arp) and again set the ip ospf network broad
cast.
c) Finally you MUST ensure that the hub router is the DR for the network. The
best way I have found to do this is to bump up its priority on the interface (e
g. ip ospf priority 200) AND make the spoke routers have a priority of 0. If y
ou don't do the second part and you reboot the hub, then the spoke(s) will take
over as DR and until you reboot them you won't get the hub to be DR again and
full connectivity will not exist. A priority of 0 means they will NEVER become
the DR, this is desirable for a spoke router.
Let me know if you would like full configs on how to do this.
Cheers
Alex.
>>> "Chad Marsh" <chad@wa.net> 22/08/99 07:53:33 >>>
Yes, but the stipulation was to use a single subnet for the frame cloud.
Chad Marsh
Alan Simpkins wrote:
>
> actually point to point subinterfaces work better because adjancencies are
> automatically established on PPP interfaces
> ----- Original Message -----
> From: Chad Marsh <chad@wa.net>
> To: Peter Van Oene <vantech@sympatico.ca>
> Cc: <ccielab@groupstudy.com>
> Sent: Saturday, August 21, 1999 2:39 PM
> Subject: Re: OSPF NBMA
>
> > For OSPF, I would think point-to-multipoint would be preferred, so you
> > would not have to worry about OSPF interface priority and DR/BDR
> > elections.
> > Anyone else?
> >
> > Chad Marsh
> >
> >
> > > Peter Van Oene wrote:
> > >
> > > Given a Partial mesh hub and spoke frame network, and having to use
> > > a single subnet for the frame cloud, what would the desired
> > > configuration be?
> > > Assuming OSPF as the routing protocol
> > >
> > > I have had best luck with frame map ip's with the broadcast parameter
> > > and when
> > > using ospf, I have used the ip ospf netword broadcast command.
> > >
> > > Is there a better way to skin this?
> > >
> > >
> > > Peter Van Oene
> > > Senior Systems Engineer
> > > UNIS LUMIN Inc.
> > > www.unislumin.com
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:21:47 GMT-3